keith



Patented Ian. 10, I899.

F. L. KEITH.

} SASH FASTENER.

(Application filed Feb. 10, 1898.)

(No Model.)

INVENTOR.

' .dttorney s;

H ESSES.

UNITED STATES PATENT OFFICE.

FRANK L. KEITII, OF DETROIT, MICHIGAN, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF TlVC-THIRDS TO CHARLES V. LATHAM AND HARRIET L. \VHITE, OF SAME PLACE.

SASH-FASTEN ER.

SPECIFICATION forming part of Letters Patent No. 617,399, dated January 10, 1899.

Application filed February 101 1898. Serial No. 669,786. (No model.)

To all whom it may concern.-

Be it known that I, FRANK L. KEITH, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improve ment in Safety WVindow-Locks and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains [O to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention has for its object a safety window-lock of novel construction and of superior efficiency and utility.

My invention consists of the construction, combination, and arrangement of devices hereinafter specified and claimed, and illustrated. in the accompanying drawings, in

which Figure 1 is a view in perspective showing a window-sash to which my invention is applied. Fig. 2 is a vertical section illustrating my invention. Fig. 3 is a View showing in perspective the twoparts of the threaded case separated one from the other to disclose the interior construction thereof. Fig. 4 is a front elevation of one of the retaining members. Fig. 5 is a rear elevation of the same.

Fig. 6 is a cross-section on the line 6 6, Fig. 5.

Fig. 7 is a cross-section of the key.

The aim of my invention is to provide a safety window-lock'which may be easily op-- provided with attaching perforated ears (in-- dicated at a.) for securing the case upon one of the window-sashes, as upon the lower sash, as shown in Fig. 1. These ears are preferably formed on the upper portion A of the case, the two parts A A being so constructed that the under portion A will be interleaved or interlocked with the portion A and be securely held in place between the upper portion A and the window-sash.

Although I do not limit myself solely to the construction of the case A herewith shown, it will be convenient to construct the portion A with recesses a to fit about the downwardly-projecting portion a of the cars a and with an intermediate rib a to fit into the space a, between said ears. The opposite side of the portion A may be recessed, as shown at a to fit about the upper portion a of the ear on the opposite side of the portion A. In this way the two parts are held against moving longitudinally the one on the other, as well as againstlateral movement,

while the under part being held between the 6 5 portion A and the sash is securely held in place. As so constructed the two threaded portions of the case A may be cast,the threads being cast therein, making the construction of the case simple and economical. B indicates a threaded key having a threaded engagement in the case A. This key may also be of castmetal, the sides I) I) being smooth to facilitate the casting of the same.

The key is provided with an operating-head B'and with a flaring head B at the opposite extremity.

0 indicates a retaining member, a desired number of which may be secured to the oppo= site sash, as to the upper sash of a window, at desired intervals one from the other. These retaining members are each construct ed with an elongated inwardly-projecting orifice or groove (indicated at C) undercut or dovetailed on its inner surface and opening through the periphery of said member to the exterior, the inner head 13 of the key corresponding in form to the undercut inner surface or dovetailportion of the retaining member,the head B being in the nature of a tenon fitting into the dovetailed groove C of the retaining member. The under surface may pref erably be formed with undercut sockets (indicated at c cin Fig. 5) shaped to the form of the head B the groove C forming a communication for the key to traverse from one socket to another. This construction would be more secure; but I do not limit myself solely thereto. The retaining member may also be provided with screw-holes 0, whereby said member may be fastened in place. The lower retaining member 0 upon the upper sash may be located with the orifice 0 opening upward, while the other retaining members thereabove would preferably have the orifice reversed in position, as indicated in Fig. 1. The lower retaining member in order to set closely to the upper rail of the lower sash should be straight on its lower edge, as indicated in the form shown in Fig. 4, although the particular form of the retaining member is not essential to my invention. It will be perceived that when the sash is in closed position the inner head of the key will be engaged in the recess 0' of the lower retaining member and under the undercut or dovetail edges of said recess. Obviously by turning the key in the proper direction the head B will be tightened in its engagement under the adjacent portions of the retaining member to securely lock the sash together. By turning the key in the opposite direction the fastening will be unlocked, so that the sash may be moved. The inner end of the case is preferably recessed, as indicated at of, to permit the head B being retracted thereinto, if desired, in order that the head B may be out of the way entirely of any of the retaining members should it be desired to raise the sash to a wider degree, permitting the head B to ride past the retaining members. It will be observed that this device may be employed not only to lock the window-sash in desired position, but to serve to stop any rattling of the window-sash as well.

\Vhat I claim as my invention is- In a safety window-lock, the combination of a case formed of two separable interiorlythreaded parts, a keyengaged therein, and a retaining member constructed with an elongated orifice opening through the periphery thereof, whereby the inner end of the key may enter the open end of the orifice in a direction longitudinal of said orifice, said orifice having undercut margins, the inner end of said key formed with a correspondinglyshaped head to engage in said orifice, the inner end of said case recessed to receive the inner head of the key, substantially as set forth.

In testimony whereof I sign this specification in the presence of two witnesses.

FRANK L. KEITH.

\Vitnesses:

N. S. WRIGHT, MARY IIICKEY. 

